dart2js: Fix crash with reference to type literal in static context.

pkg/compiler/lib/src/ssa/builder.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   SsaCodeGeneratorTask generator;
   SsaBuilderTask builder;
   SsaOptimizerTask optimizer;
@@ skipping 4121 matching lines @@
                // never built standalone, so [isBuildingFor] will
                // always return true when seeing one.
                (member.isField && !isBuildingFor(member))) {
       // The type variable is stored in a parameter of the method.
       return localsHandler.readLocal(typeVariableLocal);
     } else if (member.isInstanceMember) {
       // The type variable is stored on the object.
       return readTypeVariable(member.enclosingClass,
                               type.element);
     } else {
-      // TODO(ngeoffray): Match the VM behavior and throw an
-      // exception at runtime.
       compiler.internalError(type.element,
-          'Unimplemented unresolved type variable.');
+          'Unexpected type variable in static context.');
       return null;
     }
   }
 
   HInstruction analyzeTypeArgument(DartType argument) {
     assert(assertTypeInContext(argument));
     if (argument.treatAsDynamic) {
       // Represent [dynamic] as [null].
       return graph.addConstantNull(compiler);
     }
@@ skipping 2491 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }